 | | | classic vanishing point perspective vs. perspective and perspective view | classic vanishing point perspective vs. perspective and perspective view 2005-02-28 - By Melanie Tonkin
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So you're adding elements to the perspective drawing? ouch.. The only
thing I can think of is to block out one of the elements in the drawing
from the plan information, extend lines from horizontal, parallel lines
to give a visual cue of the vanishing points, match that to your drawing
and then insert your new objects relative to that.
I'm not quite sure what you mean by symmetrical vanishing points,
basically there should be a vanishing point for every set of lines that
are horizonal and parallel to each other. The total number in the
drawing depends on the angles in actual plan. The ground plane and all
horizontal lines should converge on the horizon line.
Afaik there is no simple way to figure out what focal length to use.
What affects the way the perspective looks is the distance of the
observer to the object of interest - so the further away you are, the
further apart the vanishing points will be, and the receding walls will
look longer. This effect is more apparent if the focal length is
smallish (10mm worked pretty obviously in the eg i just tried).
Sorry, no easy answer... If anyone else knows i'd be keen to hear it.
-- --Original Message-- --
From: robert slawinski [mailto:roberts@(protected)]
Sent: Tuesday, 1 March 2005 9:59 a.m.
To: XSI@(protected)
Subject: RE: classic vanishing point perspective vs. perspective and
perspective view
thanks for your answer, but what about the focal length? how about if
vanishing points are not symmetrical. <rs>
At 09:44 PM 2/27/2005, you wrote:
>hey robert -
>
>The distinguishing features of one and two point perspective drawings
>are that all horizontal lines diverge to one or two vanishing points
>(both on a horizon line), and that all vertical lines are vertical (and
>parallel).
>
>To set this up in XSI just link the y position of the camera interest
>to the y pos of the camera.
>
>hope that helps,
>mel
>
>-- --Original Message-- --
>From: robert slawinski [mailto:roberts@(protected)]
>Sent: Monday, 28 February 2005 3:22 p.m.
>To: XSI@(protected)
>Subject: classic vanishing point perspective vs. perspective and
>perspective view
>
>hi,
>
>i have the drawing which was done based on diagrams of elevations. this
>is perspective drawing, which from the very beginning looks quite
>strange, although when you put the elevation drawings it in educational
>software (Cabri Geometry II Plus) calculating (among many others)
>perspective distortion everything seems to fit.
>
>i modeled this set of objects using the measurements and tried to match
>it in perspective and camera view. no luck. i did rhotoskoping many
>times before, although i've never used drawings. only photographs or
>movie/video frames.
>
>my question:
>
>is the one or two vanishing point perspective distortion different than
>this used by the XSI's camera and perspective view? what could be the
>reason i cannot rotoskope this object on the picture even if it was
>drown according classic perspective rulles?
>
>thanks in advance. <rs>
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